>> when the vice president of the united states directly contradicts the testimony, sworn testimony, of state department officials, american citizens have a right to know just what's going on. and we're going to find out. >> we cover it all this morning with our own debate. joining the conversation, virginia's republican governor bob mcdonnell. former democratic governor of michigan jennifer granholm. atlanta's democratic mayor kasim reed. republican strategist alex castellanos. and nbc's tom brokaw. >>> and later, politics, satire, and lots of laughs. i go one-on-one with stephen colbert. in character -- >> i don't really watch the news so much. i come in around 6:30 and i just say the opposite of whatever racheldo